If one side is out of alignment then the machine is going to cut parallelograms rather than squares. So my cunning plan is to cut a square, put in on a good surface and try and measure if it's out and if so by how much. I'll need to scale that up to the length of the axis which should then tell me how much the axis is out. Then I'll need to drive one of the steppers an appropriate number of steps to cure it. Well ... that's my theory! Any comments?